forked from OSchip/llvm-project
88 lines
2.9 KiB
CMake
88 lines
2.9 KiB
CMake
# ------------------------------------------------------------------------------
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# Cpu features definition and flags
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# ------------------------------------------------------------------------------
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# Initialize ALL_CPU_FEATURES as empty list.
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set(ALL_CPU_FEATURES "")
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if(${LIBC_TARGET_ARCHITECTURE_IS_X86})
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set(ALL_CPU_FEATURES SSE2 SSE4_2 AVX2 AVX512F FMA)
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set(LIBC_COMPILE_OPTIONS_NATIVE -march=native)
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elseif(${LIBC_TARGET_ARCHITECTURE_IS_AARCH64})
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set(LIBC_COMPILE_OPTIONS_NATIVE -mcpu=native)
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endif()
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# Making sure ALL_CPU_FEATURES is sorted.
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list(SORT ALL_CPU_FEATURES)
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# Function to check whether the target CPU supports the provided set of features.
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# Usage:
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# cpu_supports(
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# <output variable>
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# <list of cpu features>
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# )
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function(cpu_supports output_var features)
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_intersection(var "${LIBC_CPU_FEATURES}" "${features}")
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if("${var}" STREQUAL "${features}")
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set(${output_var} TRUE PARENT_SCOPE)
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else()
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unset(${output_var} PARENT_SCOPE)
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endif()
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endfunction()
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# ------------------------------------------------------------------------------
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# Internal helpers and utilities.
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# ------------------------------------------------------------------------------
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# Computes the intersection between two lists.
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function(_intersection output_var list1 list2)
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foreach(element IN LISTS list1)
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if("${list2}" MATCHES "(^|;)${element}(;|$)")
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list(APPEND tmp "${element}")
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endif()
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endforeach()
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set(${output_var} ${tmp} PARENT_SCOPE)
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endfunction()
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# Generates a cpp file to introspect the compiler defined flags.
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function(_generate_check_code)
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foreach(feature IN LISTS ALL_CPU_FEATURES)
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set(DEFINITIONS
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"${DEFINITIONS}
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#ifdef __${feature}__
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\"${feature}\",
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#endif")
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endforeach()
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configure_file(
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"${LIBC_SOURCE_DIR}/cmake/modules/cpu_features/check_cpu_features.cpp.in"
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"cpu_features/check_cpu_features.cpp" @ONLY)
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endfunction()
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_generate_check_code()
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set(LIBC_CPU_FEATURES "" CACHE PATH "Host supported CPU features")
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if(CMAKE_CROSSCOMPILING)
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_intersection(cpu_features "${ALL_CPU_FEATURES}" "${LIBC_CPU_FEATURES}")
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if(NOT "${cpu_features}" STREQUAL "${LIBC_CPU_FEATURES}")
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message(FATAL_ERROR "Unsupported CPU features: ${cpu_features}")
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endif()
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message(STATUS "Set CPU features: ${cpu_features}")
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set(LIBC_CPU_FEATURES "${cpu_features}")
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else()
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# Populates the LIBC_CPU_FEATURES list from host.
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try_run(
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run_result compile_result "${CMAKE_CURRENT_BINARY_DIR}/check_${feature}"
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"${CMAKE_CURRENT_BINARY_DIR}/cpu_features/check_cpu_features.cpp"
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COMPILE_DEFINITIONS ${LIBC_COMPILE_OPTIONS_NATIVE}
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COMPILE_OUTPUT_VARIABLE compile_output
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RUN_OUTPUT_VARIABLE run_output)
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if("${run_result}" EQUAL 0)
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message(STATUS "Set CPU features: ${run_output}")
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set(LIBC_CPU_FEATURES "${run_output}")
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elseif(NOT ${compile_result})
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message(FATAL_ERROR "Failed to compile: ${compile_output}")
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else()
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message(FATAL_ERROR "Failed to run: ${run_output}")
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endif()
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endif()
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